Non-chromate aqueous metal surface treating composition, surface-treated steel, painted steel, steel surface treatment method, and painted steel preparing method
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsKazuyuki Matsumura, Mitsuo Asai
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Abstract
A non-chromate aqueous metal surface treating composition is provided comprising water and an organosilicon compound obtained through hydrolysis of a mixture of a hydrolyzable silane bearing a nitrogen-containing organic group or a partial hydrolyzate thereof and another hydrolyzable silane or a partial hydrolyzate thereof. The surface treating composition is applied to steel members, giving surface treated steel members having high corrosion resistance and workability. When an overcoat layer is formed thereon, painted steel members of quality are manufactured.
Claims7
A non-chromate aqueous metal surface treating composition comprising
- [I] an organosilicon compound obtained through hydrolysis of (A) 100 parts by weight of a hydrolyzable silane bearing a nitrogen-containing organic group having the general formula (1):
- YR1mSiR23-m (1)
- wherein R1 is a nitrogen-free, substituted or unsubstituted, monovalent hydrocarbon group of 1 to 8 carbon atoms, R2 is an alkoxy or acyloxy group of 1 to 4 carbon atoms, Y is a nitrogen-containing organic group, and m is 0 or 1, or a partial hydrolyzate thereof, and (B) 5 to 200 parts by weight of a hydrolyzable silane having the general formula (2):
- R1nR33-nSi—(CH2)a—SiR1nR3-n (2)
- wherein R1 is as defined above, R3 is an alkoxy or acyloxy group of 1 to 4 carbon atoms, n is 0 or 1, and a is an integer of 1 to 10, or a partial hydrolyzate thereof, and
- [II] water.
Dependencies are inferred from the claim text.